A number of human resources are the social production of the necessary preconditions .
一定数量的人力资源是社会生产的必要的先决条件。
Health and education are often necessary preconditions for meaningful participation in public life.
医疗和教育往往是在有意义的公共参与的先决条件。
The sufficient and necessary preconditions to identify redundancy for single and multiple iteration distances are given, and a linear ordered algorithm is described.
文章给出判定单体差和多体差存在冗余的充分必要条件，以及消除冗余的线性复杂度的算法。
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